Analysis of the Priestley-Taylor alpha parameter for a bean crop

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Garcia, A.
Andre, RGB
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International Society Horticultural Science
This work deals with the Priestley-Taylor model for evapotranspiration in different grown stages of a bean crop. Priestley and Taylor derived a practical Formulation for energy partitioning between the sensible and latent heat fluxes through the a parameter. Bowen ratio energy balance (BREB) was carried out for daily sensible and latent heat flux estimations in three different crop stages. Mean daily values of Priestley-Taylor a parameter were determined for eleven days during the crop cycle. Diurnal variation patterns of a are presented for the growing, flowering and graining periods. The mean values of 1.13 +/- 0.33, 1.26 +/- 0.74, 1.22 +/- 0.55 were obtained for a day in the growing, in the flowering and for graining periods, respectively. Eleven days values of a are shown and gave a mean value of 1.23 +/- 0.10 which agree on the reported literature.
energy balance, Phaseolus vulgaris L., equilibrium rate, Bowen ratio
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Proceedings of the Third International Symposium on Irrigation of Horticultural Crops, Vols 1 and 2. Leuven 1: International Society Horticultural Science, n. 537, p. 151-157, 2000.